Safety-lock.



c.- A. MULLER.

SAFETY Lock. APPLIUTION FILED SEPT. 6, 1907.

Patented 0015.18, 1910.

CARL AUGUST MLLER, OF WITZENI-IAUSEN, GERMANY.

i ya

SAFETY-LOCK.

973,455. Specification of Letters Patent.

Patented Oct. 18, 1910.

"by turning the handle.

Serial No. 391,672. (Model.)

To all whom it may concern:

Be it known that I, CARL AUGUST MLLER, lock manufacturer, a subject ofthe German Emperor, and resident of Witzenhausen, Germany, have inventedan Improved Safety-Lock, of which the following is a specilication.

The object of the present invention is a safety lock in which a key,which can be conveniently placed in a purse, pocket or the like, is usedto couple the handle with the roll back and to unlock the handle. Thiskey is made to correspond with a number of tumblers arranged in thelock, which prevent the handle from being connected to the roll-back.After the lock has been locked or unlocked, the key is withdrawn. In thekey is an aperture which corresponds' to a projection on the roll-backof the lock. When the key has been pushed down far enough into the lock,the aperture fits over the projection, and the lock can be unlocked Toprevent such a lock being unlocked by pins, there are grooves in thecylindrical part of the handle casing in which the pins would catch whenthe handle is being turned. To prevent the key catching in these groovesit is either provided with noses or is wider than the grooves.

In order that the present invention may be more clearly understood,reference is made to the annexed drawing.

Figure 1 and Fig. 2 show sections on A. A. Fig. 3. Fig. 3 is a frontview of the lock. Fig. 4: is an outside view of the lock. Fig. 5 is asection on B. B. Fig. 1. Fig. 6 shows two views of the key.

The bolt a is moved in the known manner by means ofthe projections c onthe roll-back b. The roll-hack b can be turned from outside by thehandle CZ, when this latter has been pushed sufliciently into the locke, after a key f with an aperture Zz, has been inserted in thecylindrical part g of the handle cZ, and pushed down by means of aslider e, so that the aperture it in the said key j', coincides with aprojection i on the shaft of the roll-back f. In order that theprojection z' of the roll-back Z9 will always coincide with the aperturez, in the key, both, when the lock is unlocked and locked, a stopshoulder Za is provided on the lock casing for the projections c of theroll-back b so that the movement of this said roll-back Z9 is limited.

Although the aperture Zt in the key f with a corresponding projection z'on the rollback Z9, which can be of various forms and shapes and sizes,affords a great security against unauthorized operation of the lock,this security can be further increased by the form of the tumbler `Zwith which the key f must correspond. These tumblers generally keep t-hehandle locked against movement, z'. c. they prevent the handle fromforming the necessary coupling, with the projections on the roll-backZ), as they are pressed by springs m into a groove n in the casing 0around the cylindrical part g, Fig. l. Only when the correct key f isinserted can the tumblers Z of which there may be any number, and whosewidth corresponds to a cut inthe key f, as shown by dotted lines in Fig.5; be pressed out of the groove n. The handle Z together with thetumblers Z and the key f, can then be pushed into the lock until theaperture Zt in the key f is passed over the projections' on theroll-back Z). To further prevent the unlocking of the lock, there is acounter groove p in the casing 0 into which the tumblers may be pressedwhen a false key is being used, so that the handle cannot be pushed intothe lock.

In order that when unlocking or locking the lock, to ascertainif thehandle is in the correct position opposite the slider c so as to allowthe key f to be inserted, there is a spring influenced pin g in thecasing 0 which projects into a hollow in the handle `(Fig.

1,) but is released from the handle when y this latter is pushed intothe lock (Fig. 2).

` To prevent the handle CZ and the cylindrical part g from being pulledback when they are turned, noses g2 on the cylindrical part g, passthrough cuttings in a circular groove g1 in which the said noses turnwhen key f is pressed into engagement with the roll-back spindle.

The slider after pressing in the key f, is held in a fixed position bymeans of a spring influenced pin r. After the lock has been locked, thekey f is turned by means of the handle CZ, and cylindrical part g, andwhen these latter are pulled out, the said key f falls into a tray z5arranged at the bottom of the casing o'and from where the key f can betaken out.

To prevent the insertion of a false key f, this latter possesses agroove u, so that it can pass a pin o in the inserting channel. Toobviate the lock shield being unscrewed, two

screws to are passed through the face plate .e and screwed into nutsheld to the outer locking shields by means of clamp cheeks y.

rlhe locking of the above described lock is effected in the following`manner The key f is inserted in the insertion channel and pushed down bythe slider e. The handle is then released from the tumblers l which arepushed out of their groove n by the key. The handle together with thetumblers and the key is then pushed into the lock and turned in thedirection of the arrows, Fig. il, the projections g2 then turning in thegrooves g1. After the handle has been turned, it is pulled back togetherwith the parts g, Z, f when the key falls into the tray t, which lattercan be pulled into the dotted position shown in Fig. l so that the saidkey can be taken out.

Having now fully described my invention, what I claim and desire tosecure by Letters Patent is An improved safety lock, z'. e. a casing, aroll back situated therein, projections on said roll back, a stopshoulder to limit. the movement of said projections, a projection (t) onthe end of the roll-back, a handle a key serving to couple the handle tosaid roll-back, a cylindrical casing with a sloton top for the insertionotl the key, tumblers in said casing, a slide adapted to force the keyinto engagement with the tumblers, a spring' controlled pin for holdingsaid slide in position, a cylindrical part carried by the handle, noseson said cylindrical part, said noses being adapted to pass throughopenings in Ya groove in said cylindrical casing when the handle ispushed in, and a spring controlled pin carried by said cylindricalcasing` and adapted to engage in a recess in said cylindrical part,substantially as described and shown.

ln testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

CARL AUGUST MLLER.

litnesses M. A. HAASE, RUDOLF Gr. Romina.

